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Interrupted screw
Mechanical device used to effect a closure using a partial rotation / From Wikipedia, the free encyclopedia
An interrupted screw or interrupted thread is a mechanical device typically used in the breech of artillery guns. It is believed to have been invented in 1845.[1]
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The system has also been used to close other devices, including the joint between helmet (bonnet) and breastplate (corselet) of standard diving suit helmets, and the locks of diving chambers.